Steel-condition-determining apparatus



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STEEL CONDITION DETERMINING APPARATUS Filed May 12, 192::

Sept. 17, 1929;

3 Sheets-Sheet 3 lllllllllllllllllllllllllr Patented Sept. 17, 1929 UNITED STATES PATENT OFFICE "WILL C. NEAHR, OF DENVER, COLORADO, ASlSIGNOR, BY IVIESNE ASSIGNMENTS, TO THE GARDNER-DENVER COMPANY, OF QUINCY, ILLINOIS, A CORPORATION OF DELAWARE Application filed May 12,

inent,

Figure 2 is a bottom plan View thereof,-

Figure 3 is a vertical longitudinal sectional view partly diagrammatic,

Figure 4 is a front elevation on an enlarged scale of the indicating mechanisms,

Figure 5 is a vertical sectional view on the l'ine-55 of Figure 4,

Figure (l is a diagrammatic view illustrating the electrical elements and their connections.

A casing is employed, having a rear wall 7, a top wall 8, a bottom wall 9, and a central inset portion 10 closed by an integral rear wall '11. On opposite sides of the inset portion 10.

the casing has front openings, one of which is closed .by aplate 12 detachably secured in place by screws 13, or other fasteners, while the other is covered by a plate 14, preferably of insulating material and fastened in place by screws 15. The casing is adapted to be mounted on a wall or support, and to this end the rear wall 7 has an outstanding hanger lug 16 provided with a key-hole slot 17 to detachably receive a fastener, while the end walls are provided with outstanding lugs 18 in the form of hooks that engage over suitable holding studs.

The rear Wall of the inset portion 10 is provided with a horizontal elongated central View opening 19, behind which is placed a semi-cylindrical lens 20. Behind said lens and located within the casing is a radiant color coil 21 of suitable electrical resistance material and comprising a coil of relatively heavy wire, the loops of which are wound closely together. When initially heated a thin film of oxide is formed which serves as insulation between the individual turns. As a consequence of this construction, when the coil is heated, it has the appearance of a solid red bar. This coil is preferably supported at STEEL-CONDITION-DETERMINING APPARATUS 1923. Serial No. 638,678.

its ends by conductor posts 22 mounted on an I insulating block 23 secured by screws 24 to the wall 11.

lVithin the casing, behind the plate 12 is located a suitable electrical transformer 25, and the primary coil 26 thereof has leads 27 the resistance coil 32 at different points are socket-pieces 33 having their open ends exposed on the front side of the plate 14, as illustrated in Figure 1. The othcr end of the secondary coil 29 is electrically connected as shown at 34 to a cord 35 that extends from the bottom of the casing and carries a plug 36 adapted to be placed in any of the socketelements 33.

The inset portion 10 has its upper end onclosed by a hood 37 preferably of sheet metal, and having an inwardly extending bottom wall 38. The front wall of said hood is provided with a view opening 39. A borswshoe magnet 40 is pivotally mounted as shown at 41 (see Fig. 5) in the upper end of the. inset portion 10, and has depending pole arms 42 that straddle the view opening 19 and have their free terminals 43 close together. The upper end of this horse-shoe magnet carries an outstanding arm 44- located within the hood 37-38, and having a depending terminal flange 45 constituting an indicator that is normally below the view opening 39, but will rise to a position behind said view opening when the lower end of the'magnet moves outwardly. Preferably one of the screws 24 that holds the block 23, projects through the wall 11 and has a stop nut-46 of non-magnetic material against which the poles 43 of the horse-shoe magnet normally rests. The bottom Wall of the inset portion 10 is provided with a substantially V-shaped notch 47 that terminates in a vertical plane slightly in advance of the horse-shoe magnet.

WVith this construction, it will be obvious that if current is passed through the transformer, a secondary current will be generated in the circuit housed by the casing, and if the plug 36 is engaged in any one of the socket elements 33 the circuit will be closed and the coil 21 heated to a predetermined color. The color of this coil will be varied according to amount of resistance permitted in the circuit by the placing of the plug 36 in the different sockets, as will be obvious. Therefore any desired color can be created that can be viewed through the opening 19 and the lens. 20. Consequently if the end of a piece of steel is heated to a high temperature and said end is engaged in the notch- 47, it will be positioned at a point whereby the color of the steel and of the coil 21 can be easily compared. As a consequence if the proper resistance has been thrown into the secondary circuit to produce a shade for a predetermined tempering operation, it can be easily ascertained whether or not the steel is at the proper color.

It is well known that steel will lose its magnetic qualities when it is decalescent or at the proper temperature to be cooled for tempering purposes. Consequently whenthe article is positioned in coactive relation to theview opening, it will be in cooperative relation to the magnet, and if said magnet is attracted by the steel its movement will be indicated by the plate appearing behind the view open ing 39. If no movement takes place, it is an additional indication that the steel is in proper condition to be plunged in the tempering liquid orotherwise cooled or treated to secure the desired temper. w

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art, without further description, and it will be understood that various changes in the size, shape, proportion and minor details of construction, may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention what I claim as new, and desire to secure by Letters Patent, is r 1. In color determining apparatus, the combination with a. closed casing having an elongated substantially horizontal opening in. its front wall for the passage of light, a substantially horizontal radiant color coil located in the casing behind in substantially horizontal line with the opening, a horizontal substantially semi-cylindrical lens over said opening, and means on the front of the casing below the opening for positioning an article with a heated portion thereof 1n a relation to compare its color with the color pf the light transmitted from the coil by the ens.

2. In color determining apparatus, the combination with a casing having a view opening in its front wall between its ends, of a transformer in said casing on one side of the opening, a variable resistance member in said casing on the opposite side of the opening and electrically connected to the transformer, said resistance member having plug-receiving sockets opening in the front of the casing, and a light radiant coil electrically connected to the variable resistance member and located in the casing behind the view opening.

3. A color determining apparatus comprising a casing having a front wall provided with a centrally inset portion having a view opening in its rear wall and a lower wall projecting in advance of the inset portion and provided with an article positioning notch below the view opening, a light radiant color coil behind the View opening, and a variable ing and a lower wall projecting in advance.

of the inset portion and provided with an article positioning notch below the view opening, a light radiant coil behind the view opening, a variable electrical resistance member in the casing and electrically connected to the radiant coil, said member being located at one side of the inset portion and having plug sockets opening through the front wall of the casing, and an electrical transformer located in the casing on the opposite side of the inset portion and electrically connected to the variable resistance member.

5. In color determining apparatus, the combination with a support, of a color indicator carried thereby, a decalescent determining indicator associated with the color indicator, and means for simultaneously positioning an article in cooperative relation to the second indicator and in associated relation to the first indicator.

6. In color determining apparatus, the combination with a casing having a view opening, of means in the casing for creating a predetermined color that is visible through said view opening, and a decalescent determining indicator including a movable magnet mounted adjacent to the view opening.

' 7. In color determining apparatus, the combination with a casing having a view opening, of means in the casing for creating a predetermined color that is visible through said view opening, a decalescent determining indicator including a movable magnet mounted adjacent to the view opening, and means for positioning an article in associated relation to the view openingand to the magnet.

' mined color in 8. In color determining apparatus, the combination with a casing having a view opening, of means in the casing for creating a predetermined color that is visible through said view opening, and a decalescent determining indicator ineluding a movable horseshoe magnet extending around the view open ing.

9. In color determining apparatus, the combination with a casing having a view opening, of means in the casing for creating a predetermined color that is visible through said view opening, and a decalescent determining indicator comprising a housing having a view opening, a signal movable across the opening, and a magnet connected to the opening and located inthe front of the cas- IO. In color determining apparatus, the combination with a casing having an inset portion, of means for displaying a predetersaid inset portion, a magnet movably-hung in the inset portion, and an indicator operated by the magnet.

11. In color determining apparatus, the combination with a casing having an inset portion provided With a wall consisting of a view opening, of means for creating a predetermined color visible in said opening, a hood over the upper end of the inset portion, and having a view opening, a horse-shoe magnet pivotally hung in the hood and straddling the first-mentioned View opening, and an indicator carried by the magnet and movable across the view opening in the hood, the lower wall of the inset portion having an article positioning recess.

In testimony whereof I aflix my signature' WILL C. NEAHR. 

